Definitely company size matters but the reason I was asking that was because I got the feeling that UX design is about the whole system.
From what you guys have been saying and from reading around, I realized that UX is determined by a good system. It's not just about the interface design but it's about the whole engineering, may be FB, performance etc. And how that makes the user feels.
UI is about the interface, it's the gate to the system. So I thought that could be a one guy job supported by may be graphics designer, typographical experts etc.
But UX is a whole different beast. I wonder how companies handle it?